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SINGAPORE – The haze that lifted on Friday seems to be back on Saturday (Sept 21), the second day of the Formula 1 weekend.
Air quality deteriorated overnight as the 24-hour Pollutant Standards Index (PSI) inched towards the “unhealthy” range.
The 24-hour PSI reading was 92 to 97, within the moderate range, at 10am on Saturday.
It was up from a reading of 66 to 67 at 10pm the previous night.
A PSI reading of zero to 50 indicates good air quality while a reading of 51 to 100 is in the moderate range, and a reading of 101 to 200 is considered unhealthy.
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